Using a vectorcardiogram only in the horizontal plane, spots of the vector loop were colored according to a specially designed apparatus, so that changes in height of the spots could be indicated by differences in those colors. Consequently, the spatial vectorcardiogram was represented by a single, colored graph, i.e. a "color vectorcardiogram." By the use of this graph, an attempt was made to ...

E. V. DiBella, E. G. Kholmovski UCAIR, Radiology, University of Utah, Salt Lake City, UT, United States Introduction: Myocardial perfusion studies acquire images of multiple slices in each heart beat. It is typically assumed that the bolus tracking images are uniformly sampled in time. This is often not an accurate assumption, since ECG (or vectorcardiography) triggers can be missed, arrhythmia...

Wit/i the collaboration of Charles A. Bertrand, M.D., and Frederick R. Mugler, M.D. Electrocardiographic and vectorcardiographic studies on normal subjects and patients with heart disease suggest that criteria for the diagnosis of right ventricular hypertrophy can be improved and simplified. This report proposes new criteria for the electrocardiographic diagnosis of right ventricular hypertroph...

Spatial electrocardiography based on the lead field concept of McFee and Johnston appears to be theoretically more satisfactory than other systems of vectorcardiography. To determine the normal range of planar loop patterns to be expected with this technic and to compare them with those derived by previous methods, a survey of young adult males has been carried out with particular reference to ...

he sick sinus syndrome is a clinical entity charTacterized by disturbances of sinoatial impulse formation and conduction.13 Recent studies have demonstrated that abnormalities of conduction and automaticity at other specialized anatomic sites are common in subjects with symptomatic sinus node disease.'^^.^ We describe here the use of combined His bundle electrography and timed vectorcardiograph...

Four orthogonal systems of vectorcardiography that are considered to be more accurate than th(tetrahedron and cube systems were compared. In a large majority of subjects the records made with each of the 4 systems were similar. However, in 5 of 60 subjects in whom the Z lead was studied, dissimilarities were found that were considered to be significant. The possible reasons for these dissimilar...